These are all UR, so at the core make sure you focus on crafting/pulling Sky Striker-specific cards, and you can always improve the deck with non-Sky Striker cards in your duelist journey
Run a small power theme and you can sweep everything with a 4 power or higher for just three mana with Retribution of the Meek which will save Alesha
I eventually overwhelmed him with World Breakers and Chandras out of the sideboard after losing game 2 by being one damage short on a potential Mob Rule crackback
In terms of actual monsters for your Extra Deck: Masked HERO Dark Law, Vision HERO Trinity, and Elemental HERO Sunrise have immense attacking and defending stats
It is based on Pokmon Sun and Moon and includes Generation VII Pokmon and two of the game's legendary Pokmon, Solgalea and Lunala
When combined with Kediss, Emberclaw Familiar, this means Solphim will deal five damage in combat to one opponent, but a full ten to the others